TFP610
Page 27 of 28
100' (25,4 m)
60' (15,2 m)
20'
(5,1 m)
20'
(5,1 m)
40'
20'
(5,1 m)
60' (15,2 m)
100' (25,4 m)
20'
(5,1 m)
12
12
Calculation 1
Calculation 2
40'
40'
20'
(5,1 m)
100' (25,4 m)
60' (15,2 m)
20'
(5,1 m)
40'
20'
(5,1 m)
100' (25,4 m)
60' (15,2 m)
12
20'
(5,1 m)
MODEL AP SPRINKLERS
WET PIPE SYSTEM
(Ref. Figure 20-B-3)
Calculation 1:
Calculate the most demanding five
BB Sprinklers plus the two most de-
manding AP Sprinklers.
Calculation 2:
Calculate the most demanding area
up to 1500 ft
2
having AP Sprinklers.
In this case the design area will be
800 ft
2
(40 ft. x 20 ft.)
Use the most demanding calculation
(i.e., for proving the adequacy of the
water supply).
Where AP Sprinklers are utilized,
CPVC pipe may be used to supply
the AP Sprinklers, as well as the ceil-
ing sprinklers below the AP Sprin-
klers (See Page 6).
STANDARD SPRAY SPRINKLERS
WET PIPE SYSTEM
(Ref. Figure 20-C-3)
Calculation 1:
Calculate the most demanding five
BB Sprinklers plus the two most de-
manding Standard Spray Sprinklers.
Calculation 2:
Calculate the most demanding re-
mote design area (Including all sprin-
klers types) per NFPA 13 (i.e., area
reduction for quick response & 30%
increase for sloped ceilings). In this
case the theoretical design area is
1463 f t
2
(1500 ft
2
x 0.75* x 1.3). The
actual design area, however, will
need to be 1520 ft2 to pick up the
entire coverage area of the last BB
Sprinkler.
Use the most demanding calculation
(i.e., for proving the adequacy of the
water supply).
Where Standard Sprinklers are uti-
lized, CPVC pipe CANNOT be used
to supply the Standard Spray Sprin-
klers or the ceiling sprinklers below
the Standard Spray Sprinklers.
* A 25% reduction for 20 ft. ceiling.
FIGURE 21
EXAMPLE FOR A WET PIPE SYSTEM HYDRAULIC DESIGN AREA COMPARISON
OF MODEL AP SPRINKLERS VERSES STANDARD SPRAY SPRINKLERS
WHERE MODEL AP OR STANDARD SPRAY SPRINKLERS ARE USED IN HIP AREAS
OUTSIDE THE SCOPE OF APPLICATION FOR MODEL BB BACK-TO-BACK SPRINKLERS
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